The CNN host has been engaged in a glorious public spat with the pop star, mercilessly ripping her for being—let's have the list, shall we?—a "con artist," "barbaric," "grotesque" and "gruesome." (Somebody forgot to take his happy pills today.)

He's also saying that she's not welcome on his show.

Whoa, there: Not so fast, says Madonna's camp, and they've dug up evidence to prove him wrong.

But after getting wind of the diss, the pop star's manager, Guy Oseary, tweeted Morgan back last night, saying, "Really??" and attaching a copy of an invitation the singer received to appear on Morgan's U.K. show.

The letter, which was sent last October, reads:

"Piers Morgan is delighted to invite Madonna to be a special guest for his LA recording of his UK chat show - where she would be welcome to promote her new film and forthcoming album release (and perform two numbers)."

Shortly after, he tweeted, "Madonna's only been banned from my #CNN show @guyoseary—not my UK show, which sent that invite. But I'm now banning her from that too." And then he extended the boycott to her manager as well: "Oh, and I'm afraid you're banned from all my shows too @guyoseary—guilt by association, sorry."

Morgan's beef with Madonna makes her battles with censors look like pretend play. Earlier this month, he told U.K.'s Mirror, "She's a complete con artist and those arms are just terrifying...It's like watching Conan the Barbarian. She's looking even more barbaric than ever at the moment, utterly grotesque."